Sheet feeder capable of immediately detecting a paper jam

Details Sheet feeder capable of immediately detecting a paper jam Sheet feeder capable of immediately detecting a paper jam

2005-04-19

2005-04-19

Walsh, Donald P. (Department: 3653)

Sheet feeding or delivering

Delivering

Rotary conveyor

C271S256000, C399S021000

Reexamination Certificate

active

06880819

ABSTRACT:
A sheet feeder capable of immediately detecting a paper jam includes a housing, a motor attached to the housing, a driving roller, a driven roller, a rotation speed detector and a control circuit. The motor drives the driving roller to rotate, and the driving roller drives the driven roller to rotate. The driven roller cooperates with the driving roller to feed a sheet therethrough. The rotation speed detector detects the rotation speed of the driven roller and outputs a rotation speed signal. The control circuit receives the rotation speed signal to judge whether or not a paper jam occurs according to the rotation speed signal.

REFERENCES:
patent: 4834563 (1989-05-01), Ozawa et al.
patent: 5796221 (1998-08-01), Cramer et al.
patent: 6536762 (2003-03-01), Sheng et al.
patent: 3-114860 (1991-05-01), None
patent: 6-40603 (1994-02-01), None

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